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biolith

noun bi·o·lith \ ˈbīōˌlith \
variants: or less commonly biolite \-ˌlīt\
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Definition of biolith

plural -s
: a rock of organic origin : a rock produced directly by the activities of organisms

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Origin and Etymology of biolith

International Scientific Vocabulary 2bi- + -lith or -lite; originally formed as German biolith

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